WattPeek

What does it cost to run?

Choose an appliance, set your rate, see the cost.

1Choose an appliance

More appliances

Example values only. Replace with your own usage.

2Usage & rate

watts
hours

Loading country averages…

/ kWh

25 cents per kWh? Enter 0.25.

No currency conversion.

More options
days
%

Keep 100% if you entered average power. Change only for a known on/off duty cycle.

About this estimate

Enter average input power, or measured kWh for appliances that cycle on and off.

ESTIMATED RUNNING COST

Live estimate
—

Enter your usage and electricity price.

Energy breakdown
DAILY ENERGYWaiting for your numbers

A little perspective on what you use.

ENERGY FOR YOUR PERIOD—
COST PER HOUR OF USE—
Your calculation—

Combine appliances to estimate your total cost.

Explore a lower-use scenario

See the estimated saving from using this appliance less.

25% less
Potential annual saving—

Assumes the same daily usage throughout the year.

Free · No account · Calculations stay on your device Methodology ↗

Household overview

See your monthly device costs, find the biggest contributors, and edit usage below.

No appliances added yet. Your list is saved on this device when browser storage is available.

Free electricity tools

Work out your energy use, then see what it costs.

Watts to kWh calculatorConvert power and time into energy use.Calculate cost from kWhTurn measured energy into a running cost.Find your electricity priceKnow which number to use from your bill.

Explore device running costs

Worked examples and links to the calculator. Use your own usage and electricity price.

Space heaterGaming PCDehumidifierAir fryerTumble dryerFridgeWashing machineDishwasherAir conditioner
No mystery maths

A little clarity, by the kilowatt.

Your electricity unit price and how much energy you use determine the running cost. WattPeek makes that calculation visible.

(watts ÷ 1,000) × hours × price per kWh

Example: 1,000W × 2 hours at 0.25 per kWh = 0.50 per day. This is an illustration, not a current tariff.

Fixed daily charges are excluded. Average power, active time, taxes, tariff tiers and time-of-use rates can affect your actual bill. For variable rates, calculate each rate period separately.

Read our method & assumptions ↗

Frequently asked questions

Where do I find my electricity price?

Look for the unit price per kWh on your bill or supplier account. Enter it in whole currency units, including applicable per-unit taxes. Do not enter your monthly bill or fixed standing charge.

Are the appliance presets accurate?

Presets are illustrative starting values, not measured averages or manufacturer specifications. Actual draw varies. Use your manual, energy label or a plug-in meter to replace them.

What if an appliance switches on and off?

Use average measured power with active time at 100%, or use measured kWh. If you know the duty cycle, you can instead enter its on-state power and active-time percentage. Do not reduce both.

Is WattPeek really free?

Yes. All calculator features work without payment or an account. There are no paid APIs or subscriptions. We use Cloudflare Web Analytics for aggregate visit and performance statistics; see our privacy page.

Do you collect my calculations?

No calculations are sent to a server by the app. The appliance list uses browser storage. A shared link contains its calculation inputs, so only send it to people you want to see them.